Measuring instrument particularly useful for measuring waste gases from heating installations

Abstract

The present invention relates to a measuring instrument, in particular for measuring waste gases from heating installations, comprising at least one sensor and pump arranged in a measuring channel, a microcomputer for controlling the measuring sequence and for processing the sensor signals, which is connected to an alphanumeric display device and two control elements, wherein one control element serves for paging in a selection menu, by which one menu item is displayed on the display device, and wherein the other control element serves to input in accordance with the menu item displayed.

What is claimed is: 
     
       1. A compact measuring instrument for measuring waste from heating installations, comprising at least one sensor and pump arranged in a measuring channel, a microcomputer for controlling the measuring sequence and for processing sensor signals, and connected to the microcomputer an alphanumeric display device and two control elements, wherein one control element serves to page in a selection menu by which one menu item is displayed on the display device, and wherein the other control element serves to input the menu item displayed, said compact measuring instrument is carried by an operator using only one hand and is easily operated by the same one hand, wherein said control elements comprise push-buttons and wherein an additional push-button is connected to an on/off switch, and wherein each of said push-buttons are arranged in the vicinity of one edge of a front side of the measuring instrument, which side also bears the display device. 
     
     
       2. A measuring instrument as claimed in claim 1, wherein the push-buttons for the control elements are arranged closer together than the distance between the on/off push-button and the closest control element push-button. 
     
     
       3. A measuring instrument as claimed in claim 2, wherein the push-buttons for the control element are arranged within a depression. 
     
     
       4. A measuring instrument as claimed in claim 1, wherein a sequence of inputs and measurements to be performed by an operator is predetermined according to a program provided for the microcomputer. 
     
     
       5. A measuring instrument as claimed in claim 1, wherein said at least one sensor comprises a pressure sensor. 
     
     
       6. A measuring instrument as claimed in claim 5, wherein the pressure sensor is calibrated to 0 hPa before pressure measurement. 
     
     
       7. A measuring instrument as claimed in claim 1, wherein said at least one sensor comprises a temperature sensor. 
     
     
       8. A measuring instrument as claimed in claim 1, additionally comprising an intake opening and an outlet opening of the measuring channel, whereby at least the intake opening is arranged on a side of the measuring instrument furthest from the control elements. 
     
     
       9. A measuring instrument as claimed in claim 8, additionally comprising a probe line connected to the intake opening. 
     
     
       10. A measuring instrument as claimed in claim 1, wherein flexible magnets are arranged on a rear side of the instrument. 
     
     
       11. A measuring instrument as claimed in claim 1, additionally comprising a connector for transferring data. 
     
     
       12. A measuring instrument as claimed in claim 1, wherein said at least one sensor comprises an oxygen sensor and a CO sensor. 
     
     
       13. A measuring instrument as claimed in claim 12, wherein said at least one sensor additionally comprises a temperature sensor and pressure sensor. 
     
     
       14. A measuring instrument as claimed in claim 1, wherein said at least one sensor comprises at least two temperature sensors. 
     
     
       15. A compact measuring instrument for measuring waste from heating installations, comprising at least one sensor and pump arranged in a measuring channel, a microcomputer for controlling the measuring sequence and for processing sensor signals, and connected to the microcomputer an alphanumeric display device and two control elements, wherein one control element serves to page in a selection menu by which one menu item is displayed on the display device, and wherein the other control element serves to input the menu item displayed, wherein after switching-on the instrument, an oxygen measuring device present in the measuring instrument is calibrated to 20.9% by volume and a CO measuring device present in the measuring instrument is calibrated to 0 by said microcomputer.